[Checkins] [zopefoundation/Zope] 6fe9a9: Update to Zope2 4.0b1 release.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 6fe9a941d5c63e6de80b63e98d4701bbae00f020
      https://github.com/zopefoundation/Zope/commit/6fe9a941d5c63e6de80b63e98d4701bbae00f020
  Author: Michael Howitz <mh at gocept.com>
  Date:   2017-09-18 (Mon, 18 Sep 2017)

  Changed paths:
    M requirements-full.txt
    M versions-prod.cfg

  Log Message:
  -----------
  Update to Zope2 4.0b1 release.

Fixes #183.